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Mark Rutland 9257959a6e locking/atomic: scripts: restructure fallback ifdeffery 
Currently the various ordering variants of an atomic operation are
defined in groups of full/acquire/release/relaxed ordering variants with
some shared ifdeffery and several potential definitions of each ordering
variant in different branches of the shared ifdeffery.

As an ordering variant can have several potential definitions down
different branches of the shared ifdeffery, it can be painful for a
human to find a relevant definition, and we don't have a good location
to place anything common to all definitions of an ordering variant (e.g.
kerneldoc).

Historically the grouping of full/acquire/release/relaxed ordering
variants was necessary as we filled in the missing atomics in the same
namespace as the architecture used. It would be easy to accidentally
define one ordering fallback in terms of another ordering fallback with
redundant barriers, and avoiding that would otherwise require a lot of
baroque ifdeffery.

With recent changes we no longer need to fill in the missing atomics in
the arch_atomic*_<op>() namespace, and only need to fill in the
raw_atomic*_<op>() namespace. Due to this, there's no risk of a
namespace collision, and we can define each raw_atomic*_<op> ordering
variant with its own ifdeffery checking for the arch_atomic*_<op>
ordering variants.

Restructure the fallbacks in this way, with each ordering variant having
its own ifdeffery of the form:

| #if defined(arch_atomic_fetch_andnot_acquire)
| #define raw_atomic_fetch_andnot_acquire arch_atomic_fetch_andnot_acquire
| #elif defined(arch_atomic_fetch_andnot_relaxed)
| static __always_inline int
| raw_atomic_fetch_andnot_acquire(int i, atomic_t *v)
| {
| 	int ret = arch_atomic_fetch_andnot_relaxed(i, v);
| 	__atomic_acquire_fence();
| 	return ret;
| }
| #elif defined(arch_atomic_fetch_andnot)
| #define raw_atomic_fetch_andnot_acquire arch_atomic_fetch_andnot
| #else
| static __always_inline int
| raw_atomic_fetch_andnot_acquire(int i, atomic_t *v)
| {
| 	return raw_atomic_fetch_and_acquire(~i, v);
| }
| #endif

Note that where there's no relevant arch_atomic*_<op>() ordering
variant, we'll define the operation in terms of a distinct
raw_atomic*_<otherop>(), as this itself might have been filled in with a
fallback.

As we now generate the raw_atomic*_<op>() implementations directly, we
no longer need the trivial wrappers, so they are removed.

This makes the ifdeffery easier to follow, and will allow for further
improvements in subsequent patches.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605070124.3741859-21-mark.rutland@arm.com
2023-06-05 09:57:21 +02:00
..
atomic locking/atomic: scripts: restructure fallback ifdeffery 2023-06-05 09:57:21 +02:00
basic fixdep: do not parse *.rlib, *.rmeta, *.so 2023-01-22 23:43:33 +09:00
clang-tools scripts: handle BrokenPipeError for python scripts 2023-01-26 12:43:33 +09:00
coccinelle coccinelle: api/atomic_as_refcounter: include message type in output 2022-12-26 21:47:12 +01:00
dtc dts: add riscv include prefix link 2023-03-27 22:45:22 +02:00
dummy-tools kbuild: dummy-tools: pretend we understand __LONG_DOUBLE_128__ 2022-08-21 02:47:48 +09:00
gcc-plugins Merge branch 'for-linus/hardening' into for-next/hardening 2023-02-02 18:43:28 +00:00
gdb Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
genksyms genksyms: adjust the output format to modpost 2022-05-24 16:33:20 +09:00
kconfig kconfig: menuconfig: reorder functions to remove forward declarations 2023-04-17 11:03:56 +09:00
ksymoops
mod modules-6.4-rc1 2023-04-27 16:36:55 -07:00
package Kbuild updates for v6.4 2023-04-30 11:32:53 -07:00
selinux selinux: remove runtime disable message in the install_policy.sh script 2022-09-20 14:12:25 -04:00
tracing tracing: Always use canonical ftrace path 2023-02-18 14:34:09 -05:00
.gitignore kbuild: use git-archive for source package creation 2023-03-16 22:46:12 +09:00
adjust_autoksyms.sh kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
as-version.sh kbuild: Update assembler calls to use proper flags and language target 2023-01-26 12:41:38 +09:00
asn1_compiler.c ASN.1: Fix check for strdup() success 2023-04-21 08:58:00 -07:00
bloat-o-meter scripts/bloat-o-meter: use the reverse flag for sort 2023-02-02 22:50:03 -08:00
bootgraph.pl
bpf_doc.py bpf: Remove extra whitespace in SPDX tag for syscall/helpers man pages 2023-04-11 17:45:57 +02:00
cc-can-link.sh
cc-version.sh scripts: Remove ICC-related dead code 2023-04-24 10:18:32 -07:00
check_extable.sh scripts: check_extable: fix typo in user error message 2021-09-08 11:50:28 -07:00
check-git kbuild: use git-archive for source package creation 2023-03-16 22:46:12 +09:00
check-local-export kbuild: rewrite check-local-export in sh/awk 2022-09-29 04:40:15 +09:00
check-sysctl-docs sysctl: remove register_sysctl_paths() 2023-05-02 19:24:16 -07:00
checkdeclares.pl scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
checkincludes.pl
checkkconfigsymbols.py scripts: handle BrokenPipeError for python scripts 2023-01-26 12:43:33 +09:00
checkpatch.pl Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
checkstack.pl sh: remove sh5/sh64 last fragments 2023-03-23 10:02:02 +01:00
checksyscalls.sh checksyscalls: ignore fstat to silence build warning on LoongArch 2023-03-23 17:18:32 -07:00
checkversion.pl scripts: checkversion: modernize linux/version.h search strings 2021-08-05 20:55:39 +09:00
cleanfile
cleanpatch
coccicheck scripts: coccicheck: Use /usr/bin/env 2023-02-25 20:11:06 +01:00
config
const_structs.checkpatch const_structs.checkpatch.pl: add kobj_type 2023-02-08 13:33:29 +01:00
decode_stacktrace.sh scripts: decode_stacktrace: demangle Rust symbols 2022-09-28 09:01:40 +02:00
decodecode scripts/decodecode: Add support for RISC-V 2023-02-21 16:53:54 -08:00
depmod.sh
dev-needs.sh
diffconfig scripts: handle BrokenPipeError for python scripts 2023-01-26 12:43:33 +09:00
documentation-file-ref-check scripts: documentation-file-ref-check: fix bpf selftests path 2021-10-26 09:42:29 -06:00
export_report.pl
extract_xc3028.pl
extract-ikconfig scripts/extract-ikconfig: add zstd compression support 2022-08-29 13:58:47 +09:00
extract-module-sig.pl
extract-sys-certs.pl
extract-vmlinux
faddr2line scripts/faddr2line: Fix regression in name resolution on ppc64le 2022-11-16 10:42:10 +01:00
file-size.sh
find-unused-docs.sh
gcc-x86_32-has-stack-protector.sh x86/stackprotector/32: Make the canary into a regular percpu variable 2021-03-08 13:19:05 +01:00
gcc-x86_64-has-stack-protector.sh
gen_autoksyms.sh kbuild: change module.order to list *.o instead of *.ko 2022-12-14 15:42:40 +09:00
gen_ksymdeps.sh kbuild: redo fake deps at include/ksym/*.h 2021-09-03 08:17:21 +09:00
gen-randstruct-seed.sh randstruct: Move seed generation into scripts/basic/ 2022-05-08 01:33:07 -07:00
generate_initcall_order.pl
generate_rust_analyzer.py scripts: generate_rust_analyzer: Handle sub-modules with no Makefile 2023-04-07 00:53:34 +02:00
generate_rust_target.rs x86: enable initial Rust support 2022-09-28 09:02:45 +02:00
get_abi.pl scripts/get_abi: Fix wrong script file name in the help message 2022-04-24 10:38:44 +02:00
get_dvb_firmware
get_feat.pl scripts: get_feat.pl: use /usr/bin/env to find perl 2022-06-30 12:22:17 -06:00
get_maintainer.pl get_maintainer: Honor mailmap for in file emails 2022-04-29 14:38:00 -07:00
gfp-translate
head-object-list.txt scripts/head-object-list: Remove x86 from the list 2023-01-09 18:22:21 +01:00
headerdep.pl
headers_install.sh scripts: Update the CONFIG_* ignore list in headers_install.sh 2023-03-10 21:05:16 +01:00
insert-sys-cert.c
install.sh kbuild: factor out the common installation code into scripts/install.sh 2022-05-11 21:45:53 +09:00
is_rust_module.sh rust: fix regexp in scripts/is_rust_module.sh 2023-04-19 19:28:49 +02:00
jobserver-exec scripts: support GNU make 4.4 in jobserver-exec 2023-01-16 20:15:20 +09:00
kallsyms.c scripts/kallsyms: update the usage in the comment block 2023-04-17 11:03:56 +09:00
Kbuild.include kbuild: replace $(dot-target).tmp in filechk with $(tmp-target) 2023-01-22 23:43:33 +09:00
Kconfig.include kbuild: Update assembler calls to use proper flags and language target 2023-01-26 12:41:38 +09:00
kernel-doc Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
ld-version.sh kbuild: collect minimum tool versions into scripts/min-tool-version.sh 2021-04-25 05:14:26 +09:00
leaking_addresses.pl leaking_addresses: also skip canonical ftrace path 2023-03-29 06:52:08 -04:00
Lindent
link-vmlinux.sh Kbuild updates for v6.4 2023-04-30 11:32:53 -07:00
Makefile kbuild: use git-archive for source package creation 2023-03-16 22:46:12 +09:00
Makefile.asm-generic kbuild: add kbuild-file macro 2022-11-22 23:40:02 +09:00
Makefile.build rust: add pin-init API core 2023-04-12 18:41:05 +02:00
Makefile.clang kbuild: clang: do not use CROSS_COMPILE for target triple 2023-04-17 11:23:06 +09:00
Makefile.clean kbuild: add kbuild-file macro 2022-11-22 23:40:02 +09:00
Makefile.compiler kbuild: Update assembler calls to use proper flags and language target 2023-01-26 12:41:38 +09:00
Makefile.debug Makefile.debug: support for -gz=zstd 2022-11-21 10:18:39 +09:00
Makefile.defconf kbuild: Provide a version of merge_into_defconfig without override warnings 2023-02-13 20:18:28 +01:00
Makefile.dtbinst kbuild: add kbuild-file macro 2022-11-22 23:40:02 +09:00
Makefile.extrawarn kbuild: add -Wundef to KBUILD_CPPFLAGS for W=1 builds 2022-12-11 17:28:32 +09:00
Makefile.gcc-plugins gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file 2022-08-16 12:25:53 -07:00
Makefile.headersinst kbuild: prefix $(srctree)/ to some included Makefiles 2021-03-15 19:20:48 +09:00
Makefile.host kbuild: remove sed commands after rustc rules 2023-01-22 23:43:33 +09:00
Makefile.kasan kasan: remove hwasan-kernel-mem-intrinsic-prefix=1 for clang-14 2023-04-18 16:29:43 -07:00
Makefile.kcov
Makefile.kcsan kcsan: Ignore GCC 11+ warnings about TSan runtime support 2021-12-09 16:42:27 -08:00
Makefile.kmsan kmsan: add KMSAN runtime core 2022-10-03 14:03:19 -07:00
Makefile.lib kbuild: unify cmd_dt_S_dtb and cmd_dt_S_dtbo 2023-01-22 23:43:33 +09:00
Makefile.modfinal kbuild: rename cmd_$@ to savedcmd_$@ in *.cmd files 2023-01-22 23:43:33 +09:00
Makefile.modinst modules-6.3-rc1 2023-02-23 14:05:08 -08:00
Makefile.modpost kbuild: do not automatically add -w option to modpost 2023-02-05 18:51:22 +09:00
Makefile.package Kbuild updates for v6.4 2023-04-30 11:32:53 -07:00
Makefile.randstruct randstruct: Enable Clang support 2022-05-08 01:33:07 -07:00
Makefile.ubsan ubsan: remove CONFIG_UBSAN_OBJECT_SIZE 2022-01-20 08:52:55 +02:00
Makefile.userprogs
Makefile.vmlinux kbuild: Fix CFI hash randomization with KASAN 2023-01-13 15:22:03 -08:00
Makefile.vmlinux_o kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o 2022-10-03 03:52:58 +09:00
makelst
markup_oops.pl
min-tool-version.sh parisc: Raise minimal GCC version 2023-06-05 09:36:37 +02:00
misc-check kbuild: make W=1 warn files that are tracked but ignored by git 2023-01-22 23:43:33 +09:00
mkcompile_h Revert "kbuild: Make scripts/compile.h when sh != bash" 2022-09-29 04:40:15 +09:00
mksysmap scripts/kallsyms: move compiler-generated symbol patterns to mksysmap 2023-04-17 11:03:56 +09:00
mkuboot.sh
module.lds.S arm64: unwind: add asynchronous unwind tables to kernel and modules 2022-11-09 18:06:35 +00:00
modules-check.sh kbuild: change module.order to list *.o instead of *.ko 2022-12-14 15:42:40 +09:00
nsdeps scripts/nsdeps: adjust to the format change of *.mod files 2022-06-08 20:14:13 +09:00
objdiff kbuild: clean .tmp_* pattern by make clean 2022-06-05 06:20:57 +09:00
objdump-func scripts/objdump-func: Support multiple functions 2023-04-14 16:08:28 +02:00
pahole-flags.sh btf, scripts: Exclude Rust CUs with pahole 2023-01-17 17:29:42 +01:00
pahole-version.sh kbuild: Add CONFIG_PAHOLE_VERSION 2022-02-02 11:19:33 +01:00
parse-maintainers.pl
patch-kernel
profile2linkerlist.pl
prune-kernel scripts/prune-kernel: Use kernel-install if available 2022-05-11 21:46:38 +09:00
recordmcount.c recordmcount: Fix memory leaks in the uwrite function 2023-04-25 21:10:20 -04:00
recordmcount.h recordmcount: Correct st_shndx handling 2021-06-18 09:09:17 -04:00
recordmcount.pl nds32: Remove the architecture 2022-03-07 13:54:59 +01:00
relocs_check.sh powerpc: Move script to check relocations at compile time in scripts/ 2023-04-19 07:46:31 -07:00
remove-stale-files kbuild: do not put .scmversion into the source tarball 2023-01-30 13:00:30 +09:00
rust_is_available_bindgen_libclang.h scripts: add rust_is_available.sh 2022-09-28 09:02:06 +02:00
rust_is_available.sh scripts: add rust_is_available.sh 2022-09-28 09:02:06 +02:00
setlocalversion kbuild: use git-archive for source package creation 2023-03-16 22:46:12 +09:00
show_delta
sign-file.c sign-file: Fix confusing error messages 2022-08-03 23:56:20 +03:00
sorttable.c LoongArch: extable: Add type and data fields 2022-12-14 08:36:11 +08:00
sorttable.h x86,objtool: Split UNWIND_HINT_EMPTY in two 2023-03-23 23:18:58 +01:00
spdxcheck-test.sh docs: move Linux logo into a new images folder 2022-06-01 09:32:45 -06:00
spdxcheck.py scripts/spdxcheck: Put excluded files and directories into a separate file 2022-05-18 15:34:33 +02:00
spdxexclude scripts/spdxcheck: Exclude top-level README 2022-05-18 15:35:42 +02:00
spelling.txt scripts/spelling.txt: add "exsits" pattern and fix typo instances 2023-02-02 22:50:07 -08:00
sphinx-pre-install docs: sphinx-pre-install: don't require the RTD theme 2022-10-13 11:14:43 -06:00
split-man.pl
stackdelta
stackusage
subarch.include LoongArch: Add build infrastructure 2022-06-03 20:09:27 +08:00
syscallhdr.sh scripts: check duplicated syscall number in syscall table 2021-07-09 04:00:39 +09:00
syscallnr.sh scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
syscalltbl.sh scripts: check duplicated syscall number in syscall table 2021-07-09 04:00:39 +09:00
tags.sh Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
test_fortify.sh fortify: Update compile-time tests for Clang 14 2022-02-13 16:50:06 -08:00
tools-support-relr.sh Makefile: use -z pack-relative-relocs 2023-04-17 11:23:06 +09:00
unifdef.c
ver_linux Removed the oprofiled version option 2021-05-03 17:23:06 -06:00
xen-hypercalls.sh scripts: make some scripts executable 2021-08-10 09:13:25 +09:00
xz_wrap.sh